Anti-corrosion method, magnesium-containing assembly, and electronic device

Abstract

This application provides an anti-corrosion method, a magnesium-containing assembly, and an electronic device. The anti-corrosion method is applied to a contact surface between a first structural member and a second structural member. The anti-corrosion method includes: attaching a composite film to the contact surface between the first structural member and the second structural member, where the composite film includes an adhesive film and Mylar. Based on the anti-corrosion method, an efficient galvanic corrosion inhibition effect can be achieved. The magnesium-containing assembly and the electronic device obtained based on the anti-corrosion method have good anti-corrosion effects.

What is claimed is: 
     
         1 . An anti-corrosion method, applied to a contact surface between a first structural member and a second structural member, wherein the anti-corrosion method comprises: attaching a composite film to the contact surface between the first structural member and the second structural member, wherein the composite film comprises an adhesive film and Mylar. 
     
     
         2 . The anti-corrosion method according to  claim 1 , wherein a thickness of the composite film is 0.01 mm to 0.1 mm. 
     
     
         3 . The anti-corrosion method according to  claim 1 , wherein a length of the composite film is at least 0.02 mm greater than a length of the contact surface, and a width of the composite film is at least 0.02 mm greater than a width of the contact surface. 
     
     
         4 . The anti-corrosion method according to  claim 1 , wherein the first structural member is a magnesium-containing structural member, the second structural member is a steel structural member, the adhesive film in the composite film is attached to the first structural member, and the Mylar in the composite film faces the second structural member. 
     
     
         5 . The anti-corrosion method according to  claim 4 , wherein a chemical conversion film is formed on a surface of the first structural member. 
     
     
         6 . The anti-corrosion method according to  claim 5 , wherein a thickness of the chemical conversion film is less than or equal to 2 μm. 
     
     
         7 . The anti-corrosion method according to  claim 5 , wherein a component of the chemical conversion film comprises a phosphate and a metal oxide. 
     
     
         8 . A magnesium-containing assembly, comprising:
 a middle frame, wherein the middle frame comprises a body and a first swing arm connected to the body, and the middle frame is made of a magnesium alloy; and   a rotating shaft, wherein the rotating shaft comprises a body and a second swing arm connected to the body, and the rotating shaft is made of steel;   the middle frame and the rotating shaft are connected and fixed by the first swing arm and the second swing arm; and   a composite film is attached to a contact surface between the first swing arm and the second swing arm, the composite film comprises an adhesive film and Mylar, the adhesive film in the composite film is attached to a surface of the first swing arm, and the Mylar in the composite film faces the second swing arm.   
     
     
         9 . The magnesium-containing assembly according to  claim 8 , wherein a thickness of the composite film is 0.01 mm to 0.1 mm. 
     
     
         10 . The magnesium-containing assembly according to  claim 8 , wherein a length of the composite film is at least 0.02 mm greater than a length of the contact surface, and a width of the composite film is at least 0.02 mm greater than a width of the contact surface. 
     
     
         11 . The magnesium-containing assembly according to  claim 8 , wherein a chemical conversion film is formed on a surface of the middle frame or the body of the middle frame. 
     
     
         12 . The magnesium-containing assembly according to  claim 11 , wherein a thickness of the chemical conversion film is less than or equal to 2 μm. 
     
     
         13 . The magnesium-containing assembly according to  claim 11 , wherein a component of the chemical conversion film comprises a phosphate and a metal oxide. 
     
     
         14 . The magnesium-containing assembly according to  claim 8 , wherein an anti-corrosion coating is formed on the surface of the first swing arm, and the composite film is attached to the anti-corrosion coating. 
     
     
         15 . The magnesium-containing assembly according to  claim 8 , wherein the first swing arm and the second swing arm are connected and fixed by a fastener, by adhesive dispensing, or by snap-fitting. 
     
     
         16 . The magnesium-containing assembly according to  claim 15 , wherein the fastener is made of a material with a potential difference between the material and magnesium less than a specified value. 
     
     
         17 . The magnesium-containing assembly according to  claim 15 , wherein an anti-corrosion coating is formed on a surface of the fastener by electrophoresis or physical vapor deposition. 
     
     
         18 . An electronic device, comprising a magnesium-containing assembly, wherein the magnesium-containing assembly, comprising:
 a middle frame, wherein the middle frame comprises a body and a first swing arm connected to the body, and the middle frame is made of a magnesium alloy; and   a rotating shaft, wherein the rotating shaft comprises a body and a second swing arm connected to the body, and the rotating shaft is made of steel;   the middle frame and the rotating shaft are connected and fixed by the first swing arm and the second swing arm; and   a composite film is attached to a contact surface between the first swing arm and the second swing arm, the composite film comprises an adhesive film and Mylar, the adhesive film in the composite film is attached to a surface of the first swing arm, and the Mylar in the composite film faces the second swing arm.   
     
     
         19 . The electronic device according to  claim 18 , wherein a thickness of the composite film is 0.01 mm to 0.1 mm. 
     
     
         20 . The electronic device according to  claim 18 , wherein a length of the composite film is at least 0.02 mm greater than a length of the contact surface, and a width of the composite film is at least 0.02 mm greater than a width of the contact surface.